Cinge was the first boss in Super Freaks 1, a role he still plays in Ultimate Edition. However, he now has his own boss level at the end of Normal World, and he has a completely redone fight. Like in the old fight he repeatedly shoots fireballs aimed at the nearest player, but he can now curl up into a fireball and try to ram you. You'll need to wall jump to avoid this--Cinge's fight is quite literally a trial by fire to see if you've mastered the wall jump by this point in the game. When he rams the wall, his flames blow out, so you can get a few good hits on him before he ignites again.
The fight is basically done, though it just needs a bit of balancing and DEFINITELY polish. Cinge only has one complete animation and no proper death sequence yet, and as you can see his level is basically just a test room. It's coming along surprisingly quick though!